Veritas-bu

[Veritas-bu] Max Fragment size

2004-02-17 06:50:01
Subject: [Veritas-bu] Max Fragment size
From: Dave Markham" <dave.markham AT icl DOT net (Dave Markham)
Date: Tue, 17 Feb 2004 11:50:01 -0000
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I have seen in a few docs about setting this max fragment size to say 2 =
gig or anything less than the max file size your OS can handle. How I =
understand it is that this will then improve restore times as it can =
skip along these 2 gig chunks until it finds the section it needs and =
then begin a read through of that chunk to find the files needed and =
start restore.

My question is 1. Am I right in my thinking? and 2. What would be the =
downside to this? If it improves restore times what reason is there to =
not set it?

Thanks

Environments:-

Netbackup 3.2, Solaris 8 Using SUN L1000 4 DLT 7000 tape units

Netbackup 4.5 FP6 Solaris 8 Using SUN L25 and LTO drive

Dave
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<DIV><FONT face=3DArial size=3D2>I have seen in a few docs about setting =
this max=20
fragment size to say 2 gig or anything less than the max file size your =
OS can=20
handle. How I understand it is that this will then improve restore times =
as it=20
can skip along these 2 gig chunks until it finds the section it needs =
and then=20
begin a read through of that chunk to find the files needed and start=20
restore.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>My question is 1. Am I right in my =
thinking? and 2.=20
What would be the downside to this? If it improves restore times what =
reason is=20
there to not set it?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Thanks</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Environments:-</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Netbackup 3.2, Solaris 8 Using SUN =
L1000 4 DLT 7000=20
tape units</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Netbackup 4.5 FP6 Solaris 8 Using SUN =
L25 and LTO=20
drive</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Dave</FONT></DIV></BODY></HTML>

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